Cerebus Iera

From Tardis Wiki, the free Doctor Who reference

Cerebus Iera was an inhospitable planet, completely desert with freak electrical storms. It was something of an anomaly: ships that tried to pass the planet simply could not, as though a distinct barrier was preventing them from getting close. There were some legends that stated that Cerebus Iera was on the very edge of the universe. (AUDIO: The Tartarus Gate)